The conductivity of the half filled Landau level
S. V. Iordanski
Landau Institute for Theoretical Physics of the RAS, 142432 Chernogolovka, Russia
It is shown that the thermodynamic instability at the half filling of Ll leads
to the vortex
lattice formation with the electronic spectrum analogous to that of graphene
with two Dirac-Fermi
points on Brillouin cell boundary. This result is used for the explanation of
the observed current
generated by SAW (surface acoustic wave) in the heterostructure on the surface of piezoelectric GaAs.
Using the existence
of two Fermi points instead Fermi surface suggested in the previous theoretical
works, permit the
explanation of the experimental results.